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Advanced Modulation Techniques for Effective Communication Systems

This lecture focuses on modulation techniques in communication systems, including BFSK, BPSK, QPSK, OQPSK, MSK, and pulse shaping. Learn about choosing frequencies, phases, and symbols for efficient data transmission.

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Advanced Modulation Techniques for Effective Communication Systems

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Presentation Transcript

  1. Communication Theory Modulation and Channels Modulation and Channels

  2. Communication System • Today’s lecture: focus on dashed boxes Modulation and Channels

  3. BFSK Modulator • Choose between two frequencies Modulation and Channels

  4. BPSK Demodulator • Mix input with coherent reference Modulation and Channels

  5. BPSK Modulator • Choose between two phases Modulation and Channels

  6. BPSK Demodulator • Mix input with coherent reference Modulation and Channels

  7. QPSK Modulator • Transmit one of 4 symbols • In-phase and quadrature components Modulation and Channels

  8. QPSK Demodulator • Evaluate in-phase and quadrature components seperately using coherent reference Modulation and Channels

  9. OQPSK Modulator • Reduce intensity of phase change in QPSK Modulation and Channels

  10. MSK Modulator • Do away with sharp changes in phase Modulation and Channels

  11. Pulse Shapes • Combat ISI by replacing square pulses with smoother ones Modulation and Channels

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